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/* Copyright 2021 Ján Sučan <jan@jansucan.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "restore.h"
#include "format_v2.h"
#include <filesystem>
#include <fstream>
#include <vector>
void
restore(const Options::Restore &opts)
{
std::fstream diff_stream;
diff_stream.open(opts.getDiffFilePath(),
std::ifstream::in | std::ifstream::binary);
if (!diff_stream) {
throw RestoreError("cannot open diff file");
}
FormatV2::Reader diff_reader(diff_stream, opts.getBufferSize());
std::fstream out_file;
out_file.open(opts.getOutFilePath(),
std::ios::in | std::ios::out | std::ios::binary);
if (!out_file) {
throw RestoreError("cannot open output file");
}
for (;;) {
const uint64_t offset{diff_reader.readOffset()};
if (diff_reader.eof()) {
break;
}
if (!out_file.seekp(offset, std::ios_base::beg)) {
throw RestoreError("cannot seek in output file");
}
uint64_t size{diff_reader.readSize()};
while (size > 0) {
const FormatV2::RecordData rd{diff_reader.readRecordData(size)};
if (rd.size == 0) {
break;
}
if (!out_file.write(rd.data.get(), rd.size)) {
throw RestoreError("cannot write to output file");
}
size -= rd.size;
}
if (size > 0) {
throw RestoreError("cannot read all the data of the record");
}
}
}
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